Macro Programs from "The SAS System for Statistical Graphics"

Copyright: Yes, Warrantee: No

From SAS System for Statistical Graphics, First Edition; Copyright(c) 1991 by SAS Institute Inc., Cary, NC, USA.

This material is provided "as is" by SAS Institute Inc. There are no warranties, express or implied, as to merchantability or fitness for a particular purpose regarding the materials or code contained herein. The Institute is not responsible for errors in this material as it now exists or will exist, nor does the Institute provide technical support for it. Questions or problem reports concerning this material may be addressed to the author, Michael Friendly, by electronic mail:

Program Availability

The current versions of the programs may be obtained from http://www.datavis.ca/sas/sssg/macros/. To obtain the programs individually by WWW, click the FTP icons below.

The datasets used in the book are also available here in the directory http://www.datavis.ca/sas/sssg/data/ .

Macro Programs

ftp BIPLOT

Implements the biplot technique (e.g., Gabriel, 1971) for plotting multivariate observations and variables together in a single display.

ftp BOXANNO

Provides univariate marginal boxplot annotations for two-dimensional and three-dimensional scatterplots.

ftp BOXPLOT

Produces standard and notched boxplots for a single response variable with one or more grouping variables.

ftp CONTOUR

Plots a bivariate scatterplot with a bivariate data ellipse for one or more groups with one or more confidence coefficients.

ftp CORRESP

Performs correspondence analysis (also known as "dual scaling") on a table of frequencies in a two-way (or higher-way) classification. In V6+ of SAS, this analysis is also performed by PROC CORRESP.

ftp DENSITY

Calculates a nonparametric density estimate for histogram smoothing of a univariate data distribution. The program uses the Gaussian kernel and calculates an optimal window half-width (Silverman, 1986) if not specified by the user.

ftp DOTPLOT

Produces grouped and ungrouped dot charts of a single variable (Cleveland, 1984, 1985).

ftp LOWESS

Performs robust, locally weighted scatterplot smoothing (Cleveland, 1979).

ftp NQPLOT

Produces theoretical normal quantile-quantile (Q-Q) plots for single variable. Options provide a classical (mu, sigma) or robust (median, IQR) comparison line, standard error envelope, and a detrended plot.

ftp OUTLIER

Detects multivariate outliers. The OUTLIER macro calculates robust Mahalanobis distances by iterative multivariate trimming (Gnanadesikan & Kettenring, 1972; Gnanadesikan, 1977), and produces a chisquare Q-Q plot.

ftp PARTIAL

Produces partial regression residual plots. Observations with high leverage and/or large studentized residuals can be individually labeled.

ftp SCATMAT

Draws a scatterplot matrix for all pairs of variables. A classification variable may be used to assign the plotting symbol and/or color of each point.

ftp STARS

Draws a star plot of the multivariate observations in a data set. Each observation is depicted by a star-shaped figure with one ray for each variable, whose length is proportional to the size of that variable.

ftp SYMPLOT

Produces a variety of diagnostic plots for assessing symmetry of a data distribution and finding a power transformation to make the data more symmetric.

ftp TWOWAY

Performs an exploratory analysis of two-way experimental design data with one observation per cell, including Tukey's (1949) one degree of freedom test for non-additivity. Two plots may be produced: a graphical display of the fit and residuals for the additive model, and a diagnostic plot for a power transformation for removable non-additivity.